For the purpose of these regulations, the effective neutralising value of lime is calculated in accordance with the following formula:

where –

A is the effective neutralising value; and

B is the proportion of weight of lime of particle size not greater than 300 micrometres; and

C is the proportion of weight of lime of particle size greater than 300 micrometres but not greater than 850 micrometres; and

D is the proportion of weight of lime of particle size greater than 850 micrometres; and

E is the neutralising value of lime.